Electric water heater



Dec.- 17, 1935. F. J. sMaTH ELECTRIC WATER HEATER Filed Oct. 30, 1933 Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to electric heaters and its object is to provide a device of this kind which will be simple and inexpensive in construction and efcient in operation and adapted 5 particularly for quick heating of water for domestic purposes but adapted for heating water for other purposes as well.

Referring to the accompanying drawing, which is made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a View in elevation partly in section of the device,

Figure 2, a. section on line 2 2 of Figure l, and

Figure 3, a `sectional view of an enlarged detail showing one end of one of the tubes through which the water is circulated.

In the drawing numeral IB indicates a suitable casing which may be and preferably is metallic and may be'suitably ornamented so as to present an attractive appearance. A plurality of nested coiled tubes II are mounted within the casing and have their lower ends secured in a cap I2 which is closed by end I3 to form an inlet chamber I4 with which communicates a fluid inlet pipe I5. The upper ends of the coils are secured in a cap I6 which is closed by plate 3l secured by means of screws 38. These coils may be secured in any suitable way in the cap, one convenient way of do-ing this being by welding or soldering as shown at I1. The coils extend somewhat through the cap i6 and are covered by caps I 8 having small perforations flow of the water up through the coils. The upper end oi the casing I is preferably closed by a cap or cover 29 which together with the cap I6 forms a chamber 2l. An outlet pipe 22 is connected to the cover plate 22. A thin insulating casing 23 is provided around the system of coils l i and a heating unit made up of coils 24 is positioned about the casing 23. Power lines 25 and 26 communicate with the lower and upper ends of the heating coils to supply current to the coils. A relatively thick insulating jacket 27 is positioned about the heating coils 24. This jacket serves as an electrical insulator as well as a heat insulation and is positioned between the coils and the interior of the casing I. The insulating jacket 21 may be secured in place between the turned over or flanged portions 28 and 29 of the caps I6 and I2 respectively as shown or may be secured in any other suitable or convenient way.

In operation the Huid to be heated enters through the pipe l into the inlet chamber I4 passes up through the coils II into the chamber 2| from which it flows through the pipe 22 to any suitable place such as to the faucet or may be circulated through a hot water storage tank, furnace, hot water boiler, or any hot water reser- I9 which restrict the voir of suitable construction, restrictions I9 on the upper ends of the coils II retard the upward iiow of water through the coils and thus keep the water longer in heat exchange relation with the heating coils and thus 5 insuring that the water will be heated to a higher temperature. The restrictions I9, of course, may

be made any size desired depending somewhat on the volume of water to be heated, the temperature to which heated and the pressure in the system. From the construction described it will be apparent that my heating unit is very simple, may be easily and hence cheaply constructed and Y will operate to provide an efcient heating unit, particularly in that the heat from the heating coils must of necessity pass into the water in the coils II.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the .drawing and described in the specification, but only as indicated by the appended claims.

Having thus fully described my said invention, what I claim as new and desir to secure by Letters Patent, is:

1. A fluid heating device comprising an insulated casing having a plurality of nested coiled tubes therein, said tubes having the convolutions 30 thereof in contact, an electrical heating unit for heating sai-d coils an insulating jacket interposed between said coils and said heating unit and contacting therewith.

2. A fluid heating device of the kind described having a casing, a plurality of separated coiled tubes positioned in said casing, said tubes having their ends secured in caps positioned in the ends of said casing, one en-d of each of the tubes having a restriction to divide in predetermined ratio the iiow of fluid through the tubes, an insulating casing positioned about said tubes, a plurality of heating tubes positioned about said casing and an insulating jacket positioned about said heating coils.

3. A fluid heating device of the kind described comprising an insulated casing having a plurality of nested coiled tubes positioned in the casing having the convolutions thereof in contact, said tubing having an inlet chamber at the bottom of said casing and extending upward into outlet chamber in top oi said casing and closed with caps in which are restrictions equalizing the fiow of fluid through the plurality of nested coiled tubes and a plurality of heating coils positioned about and insulated from said tubes and said outer casing.

not shown. The

FRANK J. SMITH. 

